Underground drain pipe

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway

Patent

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Details

405 43, 138154, 29456, E02B 1100

Patent

active

046246037

ABSTRACT:
An underground drain pipe having an improved soil pressure resisting strength. A main portion of the pipe is constituted by a generally U-shaped strengthening member. The strengthening member is wound in a spiral with the open sides thereof directed inwardly. The strengthening member has flange webs projecting longitudinally from the inward edges thereof. A flat band having holes formed therein is wound around the strengthening member along the gap. The flat band has a plurality of small holes formed therein restricted to the area of the gap. If desired, the interior portions of the strengthening member can be sealed with a second band attached to the opposite side of the flange webs from the band having the holes formed therein.

REFERENCES:
patent: 3878685 (1975-04-01), Schmunk
patent: 3926222 (1975-12-01), Shroy et al.
patent: 4113818 (1978-09-01), Drossbach
patent: 4163619 (1979-08-01), Fales
patent: 4175882 (1979-11-01), Gilead
patent: 4487232 (1984-12-01), Kanao
patent: 4523613 (1985-06-01), Fouss et al.

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